How can I find a critical t value using a TI-84?

To find a critical t value using a TI-84 calculator, first press the "2nd" button and then "VARS" to access the DISTR menu. Select "invT" for the inverse t-distribution function. Enter the desired significance level (α) and degrees of freedom (df) in the form invT(α, df), where α is typically half of your alpha level for a two-tailed test. Press "ENTER" to display the critical t value.